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Old 29-10-2012, 07:57 PM
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PRejto (Peter)
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Join Date: Jan 2011
Location: Rylstone, NSW, Australia
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Exposures and Light Pollution?

This is probably a pretty obvious question, but I have yet to see a clear answer in print. The weather is lousy again so rather than fret about my equipment rotting I shall ask:

If one is imaging in a light polluted environment the idea would be, I assume, to take the longest sub exposure possible before LP starts to ruin the background and image. Fine. Is there some magic number for sky background (ADU) where you would say that's the limit? Would that same ADU background limit value remain the same if a light pollution filter is used? I've been experimenting with a Hutec LPF that so far seems to give me pretty good results, though at the expense of longer exposure. I'm just wondering how far I can push the subs (forgetting about guiding, flexture, etc) before knowing I've gone too far?

Thank!
Peter
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